found: Work cat.: Acorn, J.H. Acorn, the nature nut. 11. Water bugs and beetles [VR](back-swimmers are the stars of this show)
found: Britannica online, Dec. 21, 2000(back swimmer: any insect of the family Notonectidae (order Heteroptera), containing approximately 200 species)
found: ITIS, March 16, 2001(Notonectidae; Rank: Family; Vernacular name: backswimmers)
found: Merriam-Web. online, Dec. 21, 2000(back swimmer; an aquatic bug (family Notonectidae) that swims on its back)
found: Web. 3(back swimmer: insect of the family Notonectidae)
found: Encarta world Eng. dict.(backswimmer: No. Am. water bug. Family: Notonectidae)
found: Arnett Am. insects, 1993:p. 202 (Notonectidae (Backswimmer bug family))
found: Common names of insects and related organisms, 1989:p. 188 (Notonectidae: backswimmers)